[9fans] 9atom install

[erik quanstrom]

i forgot to mention the location!

        http://ftp.9atom.org/other/+usbinstamd64.bz2

i'd like to hear this is working for people, then i'll move it to
the standard location.  

        http://ftp.9atom.org/other/usbinstamd64.bz2

newftp.9atom.org has been dropped from dns.  that was
a transitional move leftover from 1 year ago.

- erik